Kyoko Kosaka
type: MusicGroup
genre: enka
genre: kayokyoku
popularity: 12
followers: 823
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe7e3c8150bca92c106684269210583e44d588638874f5be40a0188b5780fd3da
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953746
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953746
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a4544842-c403-4f4b-ad4d-5b85ea08af56.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a4544842-c403-4f4b-ad4d-5b85ea08af56.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a4544842-c403-4f4b-ad4d-5b85ea08af56
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T05:25:34Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xe7e3c8150bca92c106684269210583e44d588638874f5be40a0188b5780fd3da","name":"Kyoko Kosaka","registered_at":"2026-06-14T21:49:39Z","symbol":"NIM0586855","token_address":"0x6ef45b8089ba8c816010aa50cd4b3554b6d425b9","type":"artist","uuid":"a4544842-c403-4f4b-ad4d-5b85ea08af56"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e3c8150bca92c106684269210583e44d588638874f5be40a0188b5780fd3da. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4544842-c403-4f4b-ad4d-5b85ea08af56.json and https://artists.proofprofile.net/proofs/artist/a4544842-c403-4f4b-ad4d-5b85ea08af56.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T05:25:34Z
  text: {"copyright_id":"0xe7e3c8150bca92c106684269210583e44d588638874f5be40a0188b5780fd3da","name":"Kyoko Kosaka","registered_at":"2026-06-14T21:49:39Z","symbol":"NIM0586855","token_address":"0x6ef45b8089ba8c816010aa50cd4b3554b6d425b9","type":"artist","uuid":"a4544842-c403-4f4b-ad4d-5b85ea08af56"}
album: 恭子
  type: MusicAlbum
  date published: 1975-10-10
album: 恭子
  type: MusicAlbum
  date published: 1975-10-10
  track: 想い出まくら
    type: MusicRecording
    duration: PT3M9S
    duration ms: 189733
    explicit: false
    by artist: Kyoko Kosaka
    in album: 恭子
      type: MusicAlbum
      date published: 1975-10-10
    genre: enka
    genre: kayokyoku
    isrc code: JPPC07500270
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T10:39:49+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xfb278a989bf5808f3eba9474d938625ecd0af926e1c139a953e6e9281315b875
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958152
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958152
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPC07500270
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T12:00:27Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb278a989bf5808f3eba9474d938625ecd0af926e1c139a953e6e9281315b875. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPC07500270 — a six-check JSON result.
      date published: 2026-07-15T12:00:27Z
    audio: 想い出まくら
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 125.433
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.487
      additional property: Energy
        type: PropertyValue
        value: 0.334
      additional property: Speechiness
        type: PropertyValue
        value: 0.033
      additional property: Acousticness
        type: PropertyValue
        value: 0.628
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.092
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.561
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.932
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: フレイバー
  type: MusicAlbum
  date published: 1978-02-05